Update the `PGDATA` environment variable.

specs/phoenix/template/flake.nix

@@ -59,7 +59,7 @@
             # environment variable whenever `-D` is not specified (for e.g.
             # `postgres` and `pg_ctl`).
             # https://www.postgresql.org/docs/15/server-start.html
-            export PGDATA="$PWD/data"
+            export PGDATA="$PWD/db"
           '';
         };
       });

specs/postgres/template/flake.nix

@@ -30,7 +30,7 @@
             # environment variable whenever `-D` is not specified (for e.g.
             # `postgres` and `pg_ctl`).
             # https://www.postgresql.org/docs/15/server-start.html
-            export PGDATA="$PWD/data"
+            export PGDATA="$PWD/db"
           '';
         };
       });